Embr-Thermodynamics
Musson Industrial is excited to announce the release of embr-thermodynamics, an Ignition module containing scripting and expression functions for computing properties of steam via an IF97 implementation.
Who is this for?
Anyone needing to calculate steam properties between 273.15 K to 1073.15 K at pressures up to 100 MPa.
Supported Properties and Parameters
| Property | Symbol | Units | (p, T) | (p, h) | (p, s) | (h, s) | (T, s) | (ρ, T) | (p, x) | (T, x) |
|---|---|---|---|---|---|---|---|---|---|---|
| Absolute pressure | p | Pa | ✓ | ✓ | ✓ sat. | |||||
| Density | ρ | kg/m³ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ||
| Dielectric constant | ε | - | ✓ | ✓ | ✓ | ✓ | ✓ | |||
| Dynamic viscosity | η | Pa·s | ✓ | ✓ | ✓ | ✓ | ✓ | |||
| Isobaric cubic expansion coefficient | αv | 1/K | ✓ | ✓ | ✓ | ✓ | ||||
| Isothermal compressibility | κT | 1/Pa | ✓ | ✓ | ✓ | ✓ | ||||
| Kinematic viscosity | ν | m²/s | ✓ | ✓ | ✓ | ✓ | ✓ | |||
| Prandtl number | Pr | - | ✓ | ✓ | ✓ | ✓ | ||||
| Refractive index | n | - | ✓ | ✓ | ✓ | ✓ | ✓ | |||
| Specific enthalpy | h | J/kg | ✓ | ✓ | ✓ | ✓ | ||||
| Specific entropy | s | J/(kg·K) | ✓ | ✓ | ✓ | ✓ | ||||
| Specific Gibbs free energy | g | J/kg | ✓ | |||||||
| Specific internal energy | u | J/kg | ✓ | ✓ | ✓ | ✓ | ||||
| Specific isobaric heat capacity | cp | J/(kg·K) | ✓ | ✓ | ✓ | ✓ | ||||
| Specific isochoric heat capacity | cv | J/(kg·K) | ✓ | ✓ | ✓ | ✓ | ||||
| Specific volume | v | m³/kg | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ||
| Speed of sound | w | m/s | ✓ | ✓ | ✓ | ✓ | ||||
| Surface tension | σ | N/m | ✓ | ✓ | ||||||
| Temperature | T | K | ✓ | ✓ | ✓ | ✓ sat. | ||||
| Thermal conductivity | λ | W/(m·K) | ✓ | ✓ | ✓ | ✓ | ✓ | |||
| Thermal diffusivity | κ | m²/s | ✓ | ✓ | ✓ | ✓ | ||||
| Vapour fraction | x | - | ✓ | ✓ | ✓ | ✓ | ||||
| Wavelength of light | λL | m |
Scripting Functions
The following scripting functions are available in all Ignition scopes.
Each scripting function has a variety of overloads to match the Table of Supported Properties. The designer scripting hints also list the accepted parameters sets.
system.thermo.if97.compressibility(h, p, s, t)
system.thermo.if97.compressionFactor(p, t)
system.thermo.if97.density(h, p, s, t, x)
system.thermo.if97.dielectricConstant(h, p, rho, s, t)
system.thermo.if97.heatCapacityRatio(h, p, s, t)
system.thermo.if97.isentropicExponent(h, p, s, t)
system.thermo.if97.isobaricCubicExpansionCoefficient(h, p, s, t, x)
system.thermo.if97.isobaricHeatCapacity(h, p, s, t)
system.thermo.if97.isochoricHeatCapacity(h, p, s, t)
system.thermo.if97.kinematicViscosity(h, p, rho, s, t)
system.thermo.if97.prandtl(h, p, s, t)
system.thermo.if97.pressure(h, s)
system.thermo.if97.refractiveIndex(h, l, p, rho, s, t)
system.thermo.if97.saturationPressure(h, s, t)
system.thermo.if97.saturationTemperature(h, p, s)
system.thermo.if97.specificEnthalpy(p, s, t, x)
system.thermo.if97.specificEnthalpySaturatedLiquid(p, t)
system.thermo.if97.specificEnthalpySaturatedVapor(p, t)
system.thermo.if97.specificEntropy(h, p, t, x)
system.thermo.if97.specificEntropySaturatedLiquid(p, t)
system.thermo.if97.specificEntropySaturatedVapor(p, t)
system.thermo.if97.specificGibbsFreeEnergy(p, t)
system.thermo.if97.specificInternalEnergy(h, p, s, t, x)
system.thermo.if97.specificInternalEnergySaturatedLiquid(p, t)
system.thermo.if97.specificInternalEnergySaturatedVapor(p, t)
system.thermo.if97.specificVolume(h, p, s, t, x)
system.thermo.if97.specificVolumeSaturatedLiquid(p, t)
system.thermo.if97.specificVolumeSaturatedVapor(p, t)
system.thermo.if97.speedOfSound(h, p, s, t)
system.thermo.if97.vaporFraction(h, p, s, t)
Expression Functions
Because expression functions do not support operator overloading (and adding functions to cover all possibilities of parameters is impractical), this module provides a single expression function for accessing all if97 properties.
property is case-insensitive and parameters can be specified in any order.
// Usage
if97(property, [[parameter], [value]...])
// Examples
if97("specificEntropy", "p", 200000, "t", 400)
if97("saturationPressure", "t", 500)
if97("vaporFraction", "p", 110000, "t", 1150000)
Sponsorship
If you benefit from this module for commercial use, we ask you to consider sponsoring our efforts through GitHub sponsors . Your support will allow us to continue development of open-source modules and tools that benefit the entire community (plus there are some bonuses for sponsors 
).